For a list of all services and tables belonging to this service's resource, see Information on resource '__system__/tap'
This service speaks TAP, a protocol designed to allow the exchange of queries and data between clients (that's normally something running on your computer) and servers (e.g., us).
You will want to use some sort of client to query TAP services; examples for those include:
You can, in a pinch, use our service in an XML-enabled browser, too. Under Overview, look for the bullet point on tap and follow the link to "this service". Then, click on "New job..." in the job list, enter your query, click "Set query", then "Execute query". Reload the page you are redirected to now and then to see when your job is finished, then retrieve the result.
By the way, for quick ad-hoc queries from within a browser, our ADQL form service may be more convenient than TAP.
Also see the table metadata of the tables exposed here.
For information on our ADQL implementation, see the ADQL service info.
While columns with xtype adql:POINT are correctly ingested into the database, adql:REGION columns are left alone (i.e., they are strings in the database). The reason for this behaviour is that in order to infer a column type, one would have to inspect the entire table up front.
If multiple output columns in a query would end up having the same name, in the output VOTable they are disambiguated by appending underscores. This is in violation of the specification, but since fixing it would require rather intrusive changes into our software and it is not clear why one should want to use names when they are not unique to begin with, this will probably not be fixed.
You can access this service using:
ivo://org.gavo.dc/tap, or access it by entering its base URL
http://dc.zah.uni-heidelberg.de/__system__/tap/run/tapdirectly. Using an XSL-enabled web browser you can, in a pinch, also operate the service without a specialized client.
This service is published as follows:
local means it is listed on our front page, ivo_managed means it has a record in the VO registry.
VOResource XML (that's something exclusively for VO nerds)